Concept explainers
Percentiles. The pth percentile of a sorted data set is a number
Table 17-9
Percentile | Approximate location | Percentile | Approximate location |
99th |
|
1st |
|
95th |
|
5th |
|
90th |
|
10th |
|
80th |
|
20th |
|
75th |
|
25th |
|
70th |
|
30th |
|
60th |
|
40th |
|
50th |
|
In Exercises 67 through 73, you should use the table to make your estimates.
Consider a normal distribution with mean
a. Find the 90th percentile (rounded to two decimal places).
b. Find the 10th percentile (rounded to two decimal places).
c. Find the 80th percentile (rounded to two decimal places).
d. Find the 20th percentile (rounded to two decimal places).
e. Suppose that you are given that the 85th percentile is approximately 1.04. Find the 15th percentile.
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